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What does quaternary mean?

Looking for the meaning or definition of the word quaternary? Here's what it means.

Adjective
  1. Of fourth rank or order.
  2. Of a mathematical expression containing e.g. x4.
  3. Relating to or in number base four.
Noun
  1. (chemistry) A quaternary compound.
  2. (geology) The Quaternary period or the system of deposits laid down during it.
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